Drill attachment



Patented Feb. 28, 1928.

v UNITED.

.J'OSEIPHROTH, or'nnvr YORK} t; Y5, ass enoieor- EIFT'YFLPER CENT o H'A'RoLn' 'I;

' Y 'WILLIAMS; OFNEw -YO'R'KyNjYu r DRILL ArTAoiIMENn Application f led A i iie, i9a7'. Sara m. 131,349.

This invention relates; to improvements in;

drill attachmentsand more particularly to an article of equipment for-portable power drills such as electric drills.

, It is Well known that the ordinary type of electric drill is not suitable for cutting ma- Y terials such as stone, concrete, brick and:

plaster, and as a consequen'm'aitis frequently necessary when such substances are encountered, for a mechanic to resort to the time consuming and laborious practice of hand drilling, that is repeatedly striking star drill, cold chisel or theli'ke with a heavy instrument such as a hammer; A twist drill for such purpose is Wholly useless andthe result is that the-usual portablep'ower drill" must remain'idle while much time and labor is expended,

Th'fl object of the present invention is to' eliminate such laborious and time consuming practices by rendering the power drill capable of producing a reciprocative longitudinal as well as a rotary motion, so that by utilizing the proper drill, the hand'process maybe wholly eliminated and the drilling accomplished with dispatch and at a minimum expenditure of labor. 1

A feature of the present invention is its I adaptability to application to portable power drills without necessitating their alteration in any manner whatsoever.

Another feature of the invention is the supporting of the drill bit in such a manner thatwhilereceiving the force of the hamber blow it is at all times under-the guidance and control of the user, thus enabling it to be rotated or reciprocated during the drilling operation.

WVlth the above and other ob ects in 'v1ew, one embodiment of the invention consists in the novel construction, combination and arrangement of partswhich will be fully set Figure l, is a side view of a power drill, equipped with a vibratory drill attachment constructed in accordance with this invention,

Figure 2, is. an enlarged longitudinal sectional view through the drill attachment,

Figure 3, is a sectional vview taken on line 33 of Figure 2, and

, Figure 4, is a sectional view taken on line 44 of Figure '2.

Rearrange the fdrawingsin detfaih'a 56a: j

able electric drill 1Q" is} equipped with the} Y customary tool" holder 11 in" which the va rious instruments areopeiativ ely' supported in the euscomarymamierg f j to 1 V The drill attachment'le'jcomprises a 'f'ti biiff lar body. 13 equipped witlifendclosurefs 141" which are formed with openings s dispbetl in axial alignnient'yv it-h the-longitudinal 'airiis" of the body 13 Thestpenings fornif-bear 5 ings for thedrilli" the head 17 is r'or'merd withan"axialrecess 18 and' cam faces 19 forming diametrically opposed shouldersf'or a purpose to be more fully hereinafter described. 1 Slidably mountedin the opening 15, .opposite that in which theshaft 16 is mounted,

isa shank 20 which projects beyond the end I of the body 13- and carries a'tool holder such so as the chuck 21. Like the shaft 16, the shank,

- 20 is provided with a head 22. at its inner end having cam faces 23 forming shoulders at d ametrically opposed points. The'se cam faces-and shoulderscooperatewith those'on I the head 17 in converting the rotary motion of shaft 16 into reciprocative "motion in the shank 20. As shown the shank 20 projects beyond the inner end of thehead 22 and into the recess 18,'so that the parts will be maintained in axial alignment. The shank 20 is formed with a fiat surface 24 cooperating with thefiattened face 25 of the opening 15 through which the shank projects to hold the shank and body against relative turning movement. The shoulder 26 formed on the shank at the outer end of the flat face 25 provides a stop 'to limit the longitudinal. shifting movement of the shank relatively to thebody. i

vIn order to hold the heads in cooperative relation,compression coil springs 27 are'interposed between. the heads 17 and 22 and their respective end closures 14 and thus yieldingly maintain abutting endsof said heads in closecontact.

In-oper'ation ,thedevice is placed in a drill as illustrated in Figure 1 with a drilling tool such as the star drill 28 gripped in the chuck 21. The. body 13 is gripped in one hand to 1 perati'ng'inembers to be i guide'and hold the drill steady. Upon imparting rotary motion to the shaft 16, the

head 17 will be rotated and the cam faces 1 9- moving over: the cam faces 23', will cause the shank to move longitudinally of thedevice and thus produce a series of blows on the endof the drill. 1 By proper manipulation;-

of the body 13' it will be obvious that the drill 28 may be caused to wear away the concrete plaster or similar/substance, with great rapidity andthe drilling iof such substances may beeasily and cheaply accomplished.

While in the foregoing there has been shown and described one embodiment of this, invention, it is to be understood that minor changes may be made in the details of construction, combination and arrangement of parts Without departing-from the'spirit' and scope of theinvention as claimed; 7

Having thus described my invention, what I claim as new and des re to'secure by Letters Patent, is: s I I L'A'device fortransforming rotary mo- ,tion' into" reciprocating motion, consisting of a "cylindrical casing, closures the ends of saidcasing having axial openings a, dri'v ing shaft extending through one of the openings'into the casing, a drivenshaft ex;-

tending through the opposite end opening into the casing, heads fixed respectively on the inner ends of both of sa'id shafts, means to prevent rotation of saiddriven shaft rel-a tive to the casing, cam faces on each of said heads adapted to cause intermittentsepara tion of said shafts, and means disposed .be-

tween said heads and casing closures to retain said cam faces in normal engagement.

2. A device for transforming rotary motion into reciprocating motion, consisting of a cylindrical casing,'removable closures at the ends of said casing, said closures naving axial openings, a driving shaft extendingf V through one of the openings in to the casing,

a driven sh'aft extending through the oppo site end opening into' the casing, hollow 1 L heads fixed respectively on the inner ends JOSEPH orrr-.-:

In testimony whereof I afiix my signature. 7 

